Have you tried overlaying the movie shape, on the slide, with an autoshape
set to background fill? When the slideshow is displayed the movie will play
over this autoshape and it will prevent the flicker.

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Regards,
Shyam Pillai
Image Importer Wizard: http://skp.mvps.org/iiw.htm
>I have several PowerPoint presentations that I have inserted Windows Media
> player files. Most times before the movie launches there is a quick
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>
> Can someone shed some light on this? thanks